<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
                <img src="../assets/logo1.png" />
            </div>
            <!-- 登录表单区域 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_from">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="iconfont icon-renxiang"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" prefix-icon="iconfont icon-suoding" type="password">
                    </el-input>
                </el-form-item>
                <!-- 按钮区域 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                // 这是登陆表单的数据绑定对象
                loginForm: {
                    username: 'admin',
                    password: '123456',
                },
                // 这是表单的验证规则对象
                loginFormRules: {
                    //验证用户名是否合法
                    username: [
                        { required: true, message: '请输入登录名称', trigger: 'blur' },
                        { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' },
                    ],
                    //验证密码是否合法
                    password: [
                        { required: true, message: '请输入登录密码', trigger: 'blur' },
                        { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' },
                    ],
                },
            };
        },
        methods: {
            // 点击重置按钮，重置登陆表单
            resetLoginForm() {
                // console.log(this);
                this.$refs.loginFormRef.resetFields();
            },
            // 点击登录按钮，验证登陆表单
            login() {
                this.$refs.loginFormRef.validate(async valid => {
                    if (!valid) return;
                    const { data: res } = await this.$http.post('login', this.loginForm);
                    if (res.meta.status !== 200) return this.$message.error('登陆失败！');
                    this.$message.success('登陆成功!');
                    //1.将登录成功之后的token 保存到客户端的 sessionStorage中
                    //  1.1 项目中除了登录之外的其他api接口，必须在登录之后才能访问
                    //  1.2 token 只应当在当前网站打开期间生效，所以将token 保存在sessionStorage中
                    window.sessionStorage.setItem('token', res.data.token);
                    // 2.通过编程式导航跳转到后台主页，路由地址是 /home
                    this.$router.push('/home');
                });
            },
        },
    };
</script>

<style lang="less" scoped>
    .login_container {
        /* background-color: #2b4b6b; */
        background: linear-gradient(
            to right,
            #dc73c5,
            #cd74d1,
            #ba77dd,
            #a27be7,
            #847ff0,
            #658ffa,
            #419dfe,
            #00a9ff,
            #00c0ff,
            #00d6ff,
            #00e9fb,
            #5ffbf1
        );
        height: 100%;
    }

    .login_box {
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
    }

    .avatar_box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
    }

    .avatar_box img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
    }

    .login_from {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }

    .btns {
        display: flex;
        justify-content: flex-end;
    }
</style>
